<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="../reactBag/react.development.js"></script>
    <script src="../reactBag/react-dom.development.js"></script>
    <script src="../reactBag/babel.min.js"></script>
</head>

<body>
    <div id="app"></div>


    <script type="text/babel">

        class App extends React.Component{
            state = {
                change : 0,
                isHot : true
            }

            render(){
                const {change,isHot} = this.state
                return <div>
                            <button onClick = {this.fn}>加一</button>
                            <p> {change}</p>
                            <button onClick = {this.weather}>改变天气</button>
                            <p>{isHot?'热':'冷'}</p>
                       </div>
            }

            fn = ()=>{
                const {change,isHot} = this.state
                this.setState({change : change + 1}) 
            }
            weather = ()=>{
                const {change,isHot} = this.state
                this.setState({isHot : !isHot})
            }
        }
        ReactDOM.createRoot(document.getElementById('app')).render(<App/>)

    </script>
</body>

</html>